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|
package textproto
import (
"bufio"
"fmt"
"io"
"strconv"
)
type CatBlobReader struct {
r *bufio.Reader
}
func NewCatBlobReader(r io.Reader) *CatBlobReader {
return &CatBlobReader{
r: bufio.NewReader(r),
}
}
func (cbr *CatBlobReader) ReadLine() (line string, err error) {
for len(line) <= 1 {
line, err = cbr.r.ReadString('\n')
if err != nil {
return
}
}
// get-mark : <sha1> LF
// cat-blob : <sha1> SP 'blob' SP <size> LF
// <data> LF
// ls : <mode> SP ('blob' | 'tree' | 'commit') SP <dataref> HT <path> LF
// ls : 'missing' SP <path> LF
// decide if we have a cat-blob result (return early if we don't)
if len(line) <= 46 || line[40:46] != " blob " {
return
}
for _, b := range line[:40] {
if !(('0' <= b && b <= '9') || ('a' <= b && b <= 'f')) {
return
}
}
// we have a cat-blob result
var size int
size, err = strconv.Atoi(line[46 : len(line)-1])
if err != nil {
return
}
data := make([]byte, size+1)
_, err = io.ReadFull(cbr.r, data)
line += string(data[:size])
return
}
type CatBlobWriter struct {
w io.Writer
}
func NewCatBlobWriter(w io.Writer) *CatBlobWriter {
return &CatBlobWriter{
w: w,
}
}
func (cbw *CatBlobWriter) WriteLine(a ...interface{}) error {
_, err := fmt.Fprintln(cbw.w, a...)
return err
}
func (cbw *CatBlobWriter) WriteBlob(sha1 string, data string) error {
err := cbw.WriteLine(sha1, "blob", len(data))
if err != nil {
return err
}
_, err = io.WriteString(cbw.w, data)
return err
}
|
